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(No Model.) I 2 Sheets-Sheet 1.

1 1:". M. SPARROW. ELECTRIC HOT AIR FURNACE REGULATOR.

- No 295,686. Patented Mar. 25, 1884.

V Inventor.

Jul 6%, Fran/ Miller Jmr aw. Z; 4,61% #3,,

(No Model.) 2 Sheets-Sheet 2.

F. M. SPARROW.

ELBQTRIO'HOT AIR. FURNACE REGULATOR.

N 0.'295,686. Patented MM. 25, 1884.

Fig-2. 1 39.3.

N. PETERS. Pmn-umo m rw. Washvnglnm 0,6.

FRANK MILLER SPARROW, OF MATTAPOISETT, MASSACHUSETTS, ASSIGNOR. BY MESNEASSIGNMENTS. TO HIMSELF AND XVILLIAM E. SPARROYV, OF

SAME PLACE.

ELECTRIC HOT-AlR-FURNACE REGULATOR.

SPECIFICATION forming part of Letters Patent No. 295,686, dated March25, 1884.

Application filed June 13, 1883. (No model.)

To all whom. it may concern.-

Be it known that I, FRANK MILLER SPAR- now, of Mattapoisett, in thecounty of Plymove relatively to the dial.

mouth, of the Oommonwealth of Massachusetts, have invented a new anduseful Improvement in Electric Hot-Air-Furnace Regulators; and I dohereby declare the same to be described in the following specificationand rep-,

resented in the accompanying drawings, of

Figure 1 is an elevation of ahot-air furnace with myinvention appliedthereto. Fig. 2 isa vertical and median section, and Fig. 3 afrontelevation of the ashchamber valve and its operative magnet. Fig. 4 is avertical and me dian section, and Fig. 5 a front View of thesmoke-discharge-pipe valve and its operative magnet. Fig. dis a frontView of one of the electrical switches to be described.

My invention is to preserve at about an equal temperature the 1 air ofan, apartment warmed by an air-heating furnace. end I have within theapartment what is termed an ordinary F metallic thermometer 7 that is,one having adial, a hand thereto, and a mechanism which, by expansion orcontraction induced by changes of atmospheric temperature, will causethe hand to traverse or In Fig. 1 such a thermometer is shown at A asprovided with a hand, a, arranged. at one end between the metallicabutments e and f, from which wires 9 and h extend, respectively, to theopposite it poles of a galvanic battery, 13.

The air-heating furnace is shown at O as provided, in the usual manner,with air-distributing pipes D D and a smoke-discharge pipe, E, openingat or near its middle into an auxiliary pipe, F. To the throat of theashchamber of the said furnace there is a valve, G, which is shown on anenlarged scale in Figs. 2 and 3, such valve, when closed, being somewhatinclined to the horizon, and constructed so as to closeby the action ofgravity or by a spring. Extending across the Valve, which is pivoted ator near its middle to the throat, is an armature, i, which is a commonbar-magnet, and in front thereof is an elcctro-magnet, H, which issupported by To this" an arch, I. projecting from the ash-chamberthreat.

the two spools of the magnet an arm, k, can rying a switch, Z, arrangedto vibrate between two metallic abutment's, m and 11. From theseabutments wires 65 and I) extend, respectively, to the opposite poles ofthe battery. The wire with the abutment m on the stud 12 moving awayfrom the switch.

The smoke-discharge pipe E of the furnace is open at its outer end, andhas there applied to it a valve, K, (provided with an armature, a, whichis a bar-magnet,) arch L, magnet M, switch N, arm 0, and abutments r s,essentially of the furnace. Wires 0 and d extend from the two abutments1- and s of the switch N to the wires 00 and Z). The wire t of themagnet extended to and at its other end is connected to the wire 0.

In the operation of the described apparatus each valve is open when theother is closed. The thermometer is to be supposed to be in the room orapartment, the atmosphere of which is to be maintained at or about agiven temperature. On the temperature falling suffi- 'ciently to causethe hand of the thermometer to be carried against one' of the abutmentscf, an electric circuit will be closed, so as to cause the magnet M toclose the valve K. 4 In closing the valve, the stud o of it will bemoved against the switch N ,and will press it away from one and forge itagainst the other of the abutments r and 8, whereby the circuit of thesaid magits inherent magnetic attraction, be kept up to theelectro-magnet,so as to hold the valve of the electro-maguet is at oneend attached to such as hereinbei'ore described as applied to the throatof the ash-chamber,of the lire-place.

net will be broken and the .armature will, by'

From the arch th ere extends between rent elasticity of which carries itinto contact M at one end connects with the switch, and is l closed;While this takes place the magnet H direction through either of themagnets of the becomes magnetized and attracts its armature and opensthe valve G. The circuit for the magnet H then becomes broken by theaction of the stud against the switch Z. The armature 't', by itsinherent magnetic attraction, will be kept up to the magnet H, and willhold the valve open in order for air to rush into the throat of theash-chamber, and thence through the fire to increase combustion, and asa consequence the heat given out by the furnace. At the same time airwill be stopped from entering the pipe E- On the temperature of the airin the apartment increasing sufficiently to cause the thermometer-handto be moved into contact with the other of the abutments e and f, thevalve G will be closed and the valve K opened. Of course the supply ofair to the ash-chamber will thereby be stopped and air will enterthepipes E and F, whereby combustion of the fuel will be rendered slower.

In operating the magnets H and M, the thermometer-hand is to be supposedto be against the abutment e, which, by the wire h, is connected withthe positive pole P of the battery. The current then goes from thebattery through the needle and its pivot, and thence through the wires 0and it. At their junction the current divides, part of it flowingthrough one and the rest through the other of the two magnets, andthence, by means of the switches, through the wires to and c to thenegative pole N of the battery. WVhen the thermometerhand is against theabutment e, the Valve G will be opened and the valve K will be closed;but when the hand moves up to the abutment f, the valve G will be closedand the valve K will be opened, the current in the latter case beingreverse, so as to cause the magnets to repel the armatures, like polesof which will then be opposite like poles of the magnets. When thegalvanic current is passing in one circuit, such magnet will attract itsarmature, whose north pole is then to be supposed to be next the southpole of the magnet. On the current through the magnet being reversed,the poles will be changed, so as to cause the magnet to repel thearmature. Vith each magnet, its magnetized armature, switch, circuit, b

and battery, the magnetic current is caused to pass in one and next inthe opposite direction through the magnet, and the current is onlyproduced when the armature may be in movement either toward or away fromthe magnet, Thus it will be seen that the battery is not in operationwhile the armature is at rest-an advantage which will be readilyapparent to electricians.

I claim 1. In combination with a furnace and a thermostat orthermometer, substantially as described, and with the valves G and K ofthe fire-place and dischargeflue of such furnace,

the magnetic armatures, the two electromagnets, the two switches, thecurrent-wires, and battery, and abutments, as adapted and arrangedsubstantially and to operate as set forth. v

2. The combination of an electro-magnet, H, a magnetized armature, 11,therefor, a switch, Z, and its abutments m and n, a thermostat or dialthermometer, A, as described, a battery, B, and circuit-wires a, b, g,h, and 0, arranged and adapted substantially as represented, whereby anelectric current may be caused to pass in one and next in the oppositedirection through the magnet, and such current be pro-- duced only whenthe armature is in movement relatively to the magnet.

- FRANK MILLER SPARROWV.

Witnesses:

R. H. EDDY,

E. B. PRATT.

